Engineering NiS/Ni2P Heterostructures for Efficient Electrocatalytic Water Splitting
Engineering NiS/Ni2P Heterostructures for Efficient Electrocatalytic Water Splitting
复制标题
用于高效电催化水分解的 NiS/Ni2P 异质结构工程
DOI：
10.1021/acsami.7b16430
复制
发表时间：
2018-02-07
影响因子：
9.5
通讯作者：
Shen, Yan
中科院分区：
文献类型：
--
作者：
Xiao, Xin;Huang, Dekang;Shen, Yan
开发高活性、低成本的双功能材料催化析氢反应（HER）和析氧反应（OER）对水裂解具有重要意义。因此，我们提出了一种形成NiS/Ni2P异质结构的新策略。所获得的NiS/Ni2P/碳布（CC）需要111 mV的HER过电位和265 mV的OER过电位才能达到20 mA cm（-2）的电流密度，在相同条件下优于NiS和Ni2P等同类材料。此外，NiS/Ni2P/CC电极在双电极电解系统中需要1.67 V的电池电压才能提供10 mA cm(-2)，这与使用基准Pt/C并联RuO2电极的电池相当。详细的表征表明，NiS和Ni2P之间的强电子相互作用、丰富的活性位点和较小的电荷转移电阻有助于提高HER和OER活性。
Developing high-active and low-cost bifunctional materials for catalyzing the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) holds a pivotal role in water splitting. Therefore, we present a new strategy to form NiS/Ni2P heterostructures. The as-obtained NiS/Ni2P/carbon cloth (CC) requires overpotentials of 111 mV for the HER and 265 mV for the OER to reach a current density of 20 mA cm(-2), outperforming their counterparts such as NiS and Ni2P under the same conditions. Additionally, the NiS/Ni2P/CC electrode requires a 1.67 V cell voltage to deliver 10 mA cm(-2) in a two-electrode electrolysis system, which is comparable to the cell using the benchmark Pt/C parallel to RuO2 electrode. Detailed characterizations reveal that strong electronic interactions between NiS and Ni2P, abundant active sites, and smaller charge-transfer resistance contribute to the improved HER and OER activity.